Safety-valve for pneumatic tires.



E. A. Woonvf/ARD.v SAFETYl VALVE FOR PNEUMATIG TIRES.

APPLICATION FILED JULY 9. 1913.'

Patented Nov. 10, 1914.

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v EA Wooowhnu (mpi/lineages put Within the is the` .provision of a safety UNITED STATES PATENT orricE.

ERNEST A. Woonw'nnn, or SACRAMENTO, CALIFORNIA.

SAFETY-VALVE FR INEUMATIC TIRES:

Specicati'on of Letters Patent.

Patented Nov. 10, 1914.

Application filed July 9, 1913. Sera1No.778,154.

To all whom it' may concern Be it known that I, ERNEST A. VVOODWARD,

'a citizenv of the United States, residing at Sacramento, in the county of Sacramento and State of California, .have invented certain new and useful Improvements in Safety Valves for Pneumatic Tires, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to new and useful improvements in safety valves for pneumatic tires which can be conveniently applied to any well known form of pneumatic tires in lieu of the present checl'r valve.

One of the common causes yfor the blowing up of pneumatic tires on automobiles is that the air in the tire becomes heated from one cause or another, thereby producing a suliicient excessive pressure Within the tire to burst the latter. After a pnuematic tire, as now commonly made, lhas been pumped up and has been disconnected from the pump, there is no Wayof ascertainingthe amount of pressure within the tire or o automatically lrelieving any excessive pressure which may be produced Within the tire by the heating of the air therein, as a result it frequently happens that a motorist suddenly nds his `tire has blown out.

-The object of my invention islto provide a novel safety valve for pneumatic vtires which. includes in its construction not only the ordinary check valve which is used to prevent the escape of the air but which also includes a safety valve that is adapted to operate automaticallythat relieves any e'xcessive pressure which may be generated or Y tire. The safety valve is so constructedfthat it does not interfere at' all with the ordinary' operation'of the tire, but

if the pressure within the tire becomes es?.

cessive. said safety valve opens automatically to relieve the pressure.

A further object ofthe present invention valve of the above character which will possess advantages in points of eiiiciency an durability, is inexpensive to manufacture and at the same time is simplein construction and op- 59 eration..

W ith the above and other objects in View, this invention consists in the novel features of construction and the combination and arrangement of parts to be hereinafter more fully described, pointed out in the claims entirely close and `shown in the accompanying drawings, 1n Which-e y Figure l is a side elevation of a safety valve constructed in accordance with my invention; Fig. 2 is a vertical sectional view; Fig. Sis a viewin perspective, detached, of the bridge plate employed in connection with' my invention, as herein desclosed. Referring more )articularly to the drawings, l indicates't e body casing which is tubular in cross section and having its lower end removably engaged with the outer sur-- face of the tire nut Q'so that thc body casing and the removable casing 3 maybe quickly and readily applied to any well known form of automobile tire valve. The lower end of the casing is arranged within the upper end of the body casing l and is provlded with abushing 4 having a central opening 5 formed therein and which is adapted to communicate with a 'central reduced portion G, adapted to receive the upper end of the check valve T, said check valve beinglpro vided upon its outer periphery -with the usual well known screwthrezulsl whereby the bushing i will be quickly and readily engaged with the upper end of the tire valve. F rom this it will be seen that the casing 3 and its contents may be quickly and readily applied to the body member 1 and also engaged with the inner valve member 7. The bushing 4c 's provi-ded at its central portion with a bridge member 9, the intermediate portioirof which is adapted to engage the upper end of the check valve rod 7 to normally hold the check valve 'in an open position.

'A rubber packing ring 10 is provided which is adapted to be arranged beneath the outer edge of the bridge 9 to provide an air tight joint between the upper end of the valve stem T and the bushing L Arranged within the casing 3 and movable with respect thereto, is a valve member 11 having a tubular stem formed integral therewith and projecting upwardly beyond the upper end of the casing, a movable cap 13 being engaged over the upper end of the casing to the upper end of the tube. Removably arranged within the upper end of the casing 3 is an adj listing nut. 14 which forms a suitable guide for thelkfstcm 12 and at the same time provides a bearing for the upper end of the coil spring 15, said coil spring being 'arranged between the nut 14 los ' itsoentral openingwith a plurality fof open- .zo

' and the flange portion 16 o f' the valve-11 so as -to' normally retain Athe valve 11 in its closedposition.l v

Arranged within Ithe stem' 12 is the ordinary check'valve 17 'and removably arranged u'n the. upper end oi the stem is a capl 18 .w mayggbe jqulclrl and readily removedlto". ow'thejtirfe to e inflated and can be readily re laced thereon. The tempering` valve mem r 11 is rovided adjacent its :Iwer end and encircling the central bore '9. with a'groove 20 in whichi's arranged an nnnu1ar-`packing 'ring -21 adapted to frictionally engage the.l valve seat formed A,at the upper`endof the opening 5 and `the' bushing 4 to providean air tight joint when vthe .valve is inits closed position.

The adjusting nut'14 is provided adjacent ings -22 which are adaptedto communicate Q with'the interior of-the casing S'fand-With the ol'nning"1 5 when the valve 11 is in a raised position, so that when the air pres- 'sure tin .the tire becomes excessive, it will zfreadily pass out through the openings 'and v22 and `through the openings 23 formed in .the cap. 1a.

- From the above deseripaoneken in connection with the accompanyin drawings, it 'will bereadily apparent that t e tire ,may be @inflated through the 'check valve -12 n`d' the y .olpen check valve 7 the valve 12 closing after i r 'e tire has been inated to the desir ex# 'i vistent.' Should. the pressure lof'the air in the #Qd-tire become excessive, the air lwill'pass up- 'wardly throuffh the openings and '6 and bear 'against t e lower end of thevalve niem- 11', the coil vspring 15, the pressure of A"ia'hjich has beenadjusted ,by means of the 3Q nut 14,- will be .compressed 'permittingup- 'ward movement of the valve11and allow-v the air to escapeinto the casing 3 from ence it passes upwardly through the'I 'i-pelngs 22 into the cap 13 Where it passes iut through thesuitable openings 23'. From thisit vwill seen that the nut -Mmay be i and can be readily removed therefrom', when 4toextend within the casin of the tire valve -to maintain suchy tire va .vein vopen posi. tion, the end edges of such'brid'ge plate be- '.ing-straight. and unobstructed whereby the lplate is freely 'insertible within .the .recess yby the bushing' and projecting) within the tire so'that the pressureiwithin' the tire may be quickly and readily relieved' throughmyimproved safety valve after the machine. has been running considerable distance. It will also be apparent that the device may be quickly and readily applied to the well known type of pneumatic tirvalves desired. It will also be apparent that the device "is extremely simple inconstruction and can be manufactured at 'a'comparatively lowcost.

lvhile ,I have shown and described the preferred forml ofi my invention, it will be` y obvious that various changes in the detailsu of construction vand inthe roportions'may-v be lresorted to for .successfu lycarrying my' invention into practice without sacrificing any of. the nove. features or departing from the scope of the appended claim." What-I'claiin isz- The combination with a tire valve, of a I safety. valve includinga bushing serving as "0 i .a seat furthe valve, said bushing being provided with a recessl adapted to receive the free end of'fthetire valve,rca sing,\a bridge plate disposed withinthev recess ofthe bushing provided-with a; projectedportion adaptedIl of the'bushin'g, and a'gasket ixedly carried within the recess vthereof to hold the ridge plate against displacement andto assure proper joint between such bushing and'tliecasing of the tire'valv'e.

In" testimony whereof I hereunto aix my 'signature inthe presence of two. witnesses. 

